US7461799B2 - Method for industrial producing of highly dispersed powders - Google Patents

Method for industrial producing of highly dispersed powders Download PDF

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Publication number
US7461799B2
US7461799B2 US10/574,957 US57495703A US7461799B2 US 7461799 B2 US7461799 B2 US 7461799B2 US 57495703 A US57495703 A US 57495703A US 7461799 B2 US7461799 B2 US 7461799B2
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US
United States
Prior art keywords
pulverizing
gas
intermediate tank
solids
double
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Expired - Fee Related, expires
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US10/574,957
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English (en)
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US20070075167A1 (en
Inventor
Jouko Niemi
Jarkko Tamminen
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Micropulva Ltd Oy
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Micropulva Ltd Oy
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Assigned to MICROPULVA LTD OY reassignment MICROPULVA LTD OY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NIEMI, JOUKO, TAMMINEN, JARKKO
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/02—Feeding devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/06—Jet mills
    • B02C19/065—Jet mills of the opposed-jet type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

  • This invention relates to a method for industrial production of high dispersed powders, by means of which it possible to produce for the processing industry necessary powders and coating agents and pigments which are finer than before and which are most economical, effective and solid.
  • micronizing methods of different types based on the 1-phase principle are in general use, by means of which methods solid powders and coating agents and pigments necessary for the processing industry are produced.
  • devices based on the 1-phase principle as pulverizing energy high pressure energetic working gas, compressed air, steam or some shielding gas is used.
  • the material to be pulverized is fed by a double-valve feeder to a counterjet pulverizer.
  • feed pressure higher than the real pulverizing pressure is used.
  • the flow of working gas of the counterjet pulverizer is cut off or choked for a short time, when the lower valve of the double-valve feeder is opened.
  • This measure ensures effective travel of material with low bulk density to the balancing tank of the counterjet pulverizer, in the end part of which the wanted gas-solids suspension is generated from material and energetic working gas.
  • Material pulverizing takes place, depending on the matter, by means of economically developed working gas of 1-8 bar pressure. The generated gas-solids suspension makes it possible to utilize the 2-phase flow effectively.
  • the kinetic energy contained in the gas-solids suspension can be used and utilized in different pulverizing chamber units effectively in a small space, where also small particles are in the sphere of influence of high-energy particles in a controllable way.
  • acceleration nozzles of different types as occasion demands.
  • the units produce as to their granulate distribution different kinds of products, in other words thus it is possible to focus the use of energy on the production of some particle sizes or to restrict the production of some particle sizes.
  • Products pulverized in separate pulverizing units can be kept separated or joined and stored in an intermediate tank built in one or several pulverizing spheres of influence.
  • the function of intermediate storing is to control by means of mass-monitoring the volume of circulation load. In this case, producing autogenously ultra fine 0.2-5 micron particles requires in the pulverizing circle a great circulation load and it is wise to build the volume needed by the circulation load outside the normal pulverizing equipment.
  • the intermediate tank or tanks From the intermediate tank or tanks removal of material is also started as end product after the wanted circulation load quantity is generated in the pulverizing circle. Since all material that is to be pulverized moves through the pulverizing chambers of the counterjet pulverizer the particles to be pulverized stay in the pulverizing process min. for 1 pulverizing circulation and max. for as long as chosen circulations, for instance 7 circulations.
  • the intermediate tank or tanks are so dimensioned that the circulation load can be even quite big and have a weighing system, which is part of the process control. In the above case, for instance, the intermediate tank must have room for material as much as 7 ⁇ feed quantity.
  • the quantity of the removing end product is the same as the quantity of new material to be fed into the pulverizer.
  • the use of an intermediate tank enables controllable circulation of the material and makes it also possible that important, especially of solid minerals with difficulty produced particles in the size of 0.2-5.0 microns can be effectively produced in greater quantity using by pulverizing a necessary amount of pulverizing circulations and as to their geometry different acceleration nozzles.
  • Material to be returned from the intermediate tank to the counterjet pulverizer is often, depending on the matter, very light as to its bulk density, which can be even under 100 kg/m 3 . Therefore it is worse to compress the material in a separate pressing screw conveyor before feeding into the counterjet pulverizer. Increase of the bulk density improves the material handling significantly.
  • the material to be taken as end product from the intermediate tank can, if necessary, be handled by a separate mechanical classifier outside the pulverizing circle, the operating principle of which is not based on gas flows and the gas is not a factor controlling the operation.
  • a separate mechanical classifier outside the pulverizing circle
  • largest particles can be controllably separated from the end product and returned together with the circulating load to the counterjet pulverizer.
  • Coarse product separated by the classifier can be transported into the intermediate tank as a pneumatic transfer, and as transport air pressurized air releasable can be used releasable after initial pressurization, from the double-valve feeder of the intermediate tank.
  • FIG. 1 shows an example as a side view of an equipment used for utilization of the method according to the invention
  • FIG. 2 shows the equipment as per FIG. 1 from the right side.
  • Material to be pulverized or possibly pre-pulverized in a mechanical pulverizer according to the invention is fed from feed tank 1 to feed hopper 2 of double-valve feeder, from where it is let step-by-step to intermediate tank 3 of double-valve feeder, when the tank upper valve 4 has opened.
  • the intermediate tank is pressurized, for instance to a pressure of 5 bar, whereafter lower valve 5 of double-valve feeder is opened and the pressurized batch of material is by means of excess pressure forced to balancing tank 6 , into which feed of working gas from tube 7 is broken or choked for a while in order to facilitate the transfer of light material.
  • lower valve 5 is closed again, after which the pressure of intermediate tank 3 is let to the level of environment pressure conveying the pressurized gas in it somewhere through tube 21 .
  • upper valve 4 is opened for a new batch of material from feed hopper 2 .
  • Material pulverized in balancing tank 6 is then mixed with working gas, for instance pressurized in 3.5 bar pressure, into gas-solids suspension. From balancing tank 6 the gas-solids suspension is accelerated by the effect of working gas pressure through acceleration nozzles 8 of counterjet pulverizer 9 to the pulverizing chamber, where the material particles are autogenously pulverized on colliding with high speed.
  • Gas-solids suspension pulverized in counterjet pulverizer 9 is conveyed through tubes 10 and 11 to large-sized stock 12 furnished with weighing system 13 for control of the collected material quality. Namely, in intermediate depot such a quantity of solids must be collected that in the system there is a sufficient circulation load in order to achieve a wanted end product, which sufficient circulation load must be maintained all the time during pulverizing process. Air is removed from intermediate tank 12 by means of suitable nozzles 14 , which prevent the access of small material particles to open air. Solids collected into intermediate tank 12 tighten a little, which improves the handling of them, when returned to for pulverizing together with new material.
  • both the double-feed pulverizers can advantageously be synchronized so that when a material batch has been supplied the after-pressure left in tank 3 of one double-feed pulverizer can be made use of through tubes 21 and 21 a as initial pressure of tank 3 a of the other double feed pulverizer after receipt of a new material batch when valves 23 in tube 20 is kept closed. Then the gas consumption in connection with feeding gets almost halved.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
US10/574,957 2003-10-10 2003-10-10 Method for industrial producing of highly dispersed powders Expired - Fee Related US7461799B2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2003/000750 WO2005035127A1 (en) 2003-10-10 2003-10-10 A method for industrial producing of highly dispersed powders

Publications (2)

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US20070075167A1 US20070075167A1 (en) 2007-04-05
US7461799B2 true US7461799B2 (en) 2008-12-09

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US10/574,957 Expired - Fee Related US7461799B2 (en) 2003-10-10 2003-10-10 Method for industrial producing of highly dispersed powders

Country Status (8)

Country Link
US (1) US7461799B2 (de)
EP (1) EP1677915B1 (de)
CN (1) CN100435962C (de)
AT (1) ATE476256T1 (de)
AU (1) AU2003271787A1 (de)
BR (1) BR0318541A (de)
DE (1) DE60333686D1 (de)
WO (1) WO2005035127A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731142B2 (en) * 2019-01-09 2023-08-22 Qwave Solutions, Inc. Methods of jet milling and systems

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI119017B (fi) * 2005-11-28 2008-06-30 Micropulva Ltd Oy Menetelmä erittäin hienojen jauheiden teolliseksi tuottamiseksi
CN103008071A (zh) * 2011-09-30 2013-04-03 江苏中远机械设备制造有限公司 微粉制备系统
CN102600959B (zh) * 2012-04-05 2013-12-25 甘肃电力科学研究院 一种双进双出磨煤机制粉系统的协调控制系统及方法
CN103374241A (zh) * 2012-04-17 2013-10-30 鲍联 粉体改性一体化生产工艺
WO2023245000A2 (en) * 2022-06-13 2023-12-21 Russell Van De Casteele Methods for processing, enrichment, delivery, formulation, uptake and testing for supplements and pharmaceuticals

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482786A (en) * 1965-11-12 1969-12-09 Gerald V Hogg Apparatus for comminuting materials
US3877647A (en) * 1973-05-30 1975-04-15 Vladimir Ivanovich Gorobets Jet mill
US4034919A (en) * 1975-10-24 1977-07-12 Viktor Ivanovich Akunov Air-stream mill
US4592302A (en) * 1984-11-07 1986-06-03 Freund Industrial Co., Ltd. Coating method and apparatus
US4720049A (en) 1984-10-12 1988-01-19 Oy Finnpulva Ab Feeder device for pressure chamber grinder
WO1988001906A1 (en) 1986-09-10 1988-03-24 Larox Oy Method and equipment for the production of particularly finely divided dry powders
US5143303A (en) 1988-11-28 1992-09-01 Oy Finnpulva Ab Method and equipment for processing of particularly finely divided material
WO1998036840A1 (en) 1997-02-21 1998-08-27 Micropulva Ltd. Oy Equipment and method for producing ultra fine dry powders by means of a high-energy power gas
RU2149062C1 (ru) 1998-11-18 2000-05-20 Открытое акционерное общество "Лебединский горно-обогатительный комбинат" Способ управления процессом измельчения

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR950006885B1 (ko) * 1991-07-16 1995-06-26 캐논 가부시기가이샤 충돌식 기류분쇄기, 미분체제조장치 및 토너의 제조방법

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3482786A (en) * 1965-11-12 1969-12-09 Gerald V Hogg Apparatus for comminuting materials
US3877647A (en) * 1973-05-30 1975-04-15 Vladimir Ivanovich Gorobets Jet mill
US4034919A (en) * 1975-10-24 1977-07-12 Viktor Ivanovich Akunov Air-stream mill
US4720049A (en) 1984-10-12 1988-01-19 Oy Finnpulva Ab Feeder device for pressure chamber grinder
US4592302A (en) * 1984-11-07 1986-06-03 Freund Industrial Co., Ltd. Coating method and apparatus
WO1988001906A1 (en) 1986-09-10 1988-03-24 Larox Oy Method and equipment for the production of particularly finely divided dry powders
US5143303A (en) 1988-11-28 1992-09-01 Oy Finnpulva Ab Method and equipment for processing of particularly finely divided material
WO1998036840A1 (en) 1997-02-21 1998-08-27 Micropulva Ltd. Oy Equipment and method for producing ultra fine dry powders by means of a high-energy power gas
RU2149062C1 (ru) 1998-11-18 2000-05-20 Открытое акционерное общество "Лебединский горно-обогатительный комбинат" Способ управления процессом измельчения

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11731142B2 (en) * 2019-01-09 2023-08-22 Qwave Solutions, Inc. Methods of jet milling and systems

Also Published As

Publication number Publication date
ATE476256T1 (de) 2010-08-15
CN100435962C (zh) 2008-11-26
WO2005035127A1 (en) 2005-04-21
AU2003271787A1 (en) 2005-04-27
EP1677915B1 (de) 2010-08-04
CN1878613A (zh) 2006-12-13
DE60333686D1 (de) 2010-09-16
EP1677915A1 (de) 2006-07-12
US20070075167A1 (en) 2007-04-05
BR0318541A (pt) 2006-09-12

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Owner name: MICROPULVA LTD OY, FINLAND

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Effective date: 20121209